netdev - [PATCH] can: cc770: Fix use after free in cc770_tx

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180319101431.11032-2-mkl@pengutronix.de>
Date:   Mon, 19 Mar 2018 11:14:31 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Andri Yngvason <andri.yngvason@...el.com>,
        linux-stable <stable@...r.kernel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH] can: cc770: Fix use after free in cc770_tx_interrupt()

From: Andri Yngvason <andri.yngvason@...el.com>

This fixes use after free introduced by the last cc770 patch.

Signed-off-by: Andri Yngvason <andri.yngvason@...el.com>
Fixes: 746201235b3f ("can: cc770: Fix queue stall & dropped RTR reply")
Cc: linux-stable <stable@...r.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/cc770/cc770.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/cc770/cc770.c b/drivers/net/can/cc770/cc770.c
index 2743d82d4424..6da69af103e6 100644
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -706,13 +706,12 @@ static void cc770_tx_interrupt(struct net_device *dev, unsigned int o)
 		return;
 	}
 
-	can_put_echo_skb(priv->tx_skb, dev, 0);
-	can_get_echo_skb(dev, 0);
-
 	cf = (struct can_frame *)priv->tx_skb->data;
 	stats->tx_bytes += cf->can_dlc;
 	stats->tx_packets++;
 
+	can_put_echo_skb(priv->tx_skb, dev, 0);
+	can_get_echo_skb(dev, 0);
 	priv->tx_skb = NULL;
 
 	netif_wake_queue(dev);
-- 
2.16.2